Interesting to me as Sunday night, actually around 0300-0330 Monday, I awoke to go to the bathroom, then stepped out onto my balcony in Jomtien. I noticed a distinct but not very strong odor of diesel fuel. I wondered if there had been a fuel leak somewhere close, maybe an accident involving a tanker truck.
This explains it. Dropping fuel off Samut Sarkon around mid afternoon would have allowed the evaporated fuel fumes to widely disperse in the atmosphere. By morning, the scent of fuel was gone.